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What causes this?

The car runs the FC with perfect A/F ratios. Power is dead strong with excellent throttle response due to some snappy Power Excel tuning.

Fuel economy is admittedly excellent (400km on a tank) and the rear bar is clean. O2 sensor is new.

I know just about everybody (including the tuners!) thinks it sounds mad... but it's driving me up the wall.

T.

Mine pops and farts on trailing throttle, less so now since i took a bit of fuel out higher in the range but it still does it a fair bit.

Also does it if i lift completely at high revs entering a corner and let it go for a couple of seconds before reapplying the throttle.

My cat is less than 6 months old and no exhaust leaks, they were all fixed a couple of weeks back.

I like it as it's only really happening when i'm driving reasonably hard, the rest of the time i just get nothing or a quiet rich pop on gear changes.

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